The Dreieckige Pfahl ("Triangular Post") is an historic boundary stone, erected before 1866. It bears the No. 1 and, on its northeastern and southwestern sides the letters KH for Kingdom of Hanover, and on the southeastern side the letters HB for the Duchy of Brunswick (Herzogtum Braunschweig). The original triangular shape was retained. Today, there is a rest area for hikers and mountain bikers in the vicinity of the Dreieckiger Pfahl as well as box no. 168 on the Harzer Wandernadel network of hiking checkpoints